Info required for MessageCounterInfo class

Hi,
We are working with Apache Artemis 2.4.0 and trying to determine the Queue Message Counters.
1. Invoking the Jolokia API to display MessageCounterHistory:
$ curl -u artemis:artemis -H "Content-Type: application/json" -X POST -d '{"type":"exec", "mbean":"o rg.apache.activemq.artemis:broker=\"RI_BRKR\",component=addresses,address=\"BulkSend0.001.01.01\",su bcomponent=queues,routing-type=\"anycast\",queue=\"BulkSend0.001.01.01\"","operation":"listMessageCo unterHistory"}' 'http://127.0.0.1:8128/console/jolokia' && echo
{"request":{"mbean":"org.apache.activemq.artemis:address=\"BulkSend0.001.01.01\",broker=\"RI_BRKR\", component=addresses,queue=\"BulkSend0.001.01.01\",routing-type=\"anycast\",subcomponent=queues","typ e":"exec","operation":"listMessageCounterHistory"},"value":"{\"dayCounters\":[{\"date\":\"6\/25\/18\ ",\"counters\":[-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1]}]}","timesta mp":1529960031,"status":200}
The response just indicates the counters as -1, -1, -1, ...............and it is very hard to interpret this output, given that it does not reflect what each counter signifies. Can someone point towards the description or syntax of this output JSON?
All I see in the the API doc for QueueControl.listMessageCounterHostory() is that it lists the message counter history for this queue.
2. Also tried to interpret and run the message-counters example that comes with Artemis 2.4.0 (/apache-artemis-2.4.0/examples/features/standard/message-counters/src/main/java/org/apache/activemq/artemis/jms/example/MessageCounterExample.java). The example makes use of org.apache.activemq.artemis.api.core.management.MessageCounterInfo class that I do not see available in artemis-jms-client-all-2.4.0.jar. How can we run or test out the example against our broker set up to see the result of Queue Message counter related APIs as we need these for our development work further.
Thanks
Neha
Oracle Marketing Cloud